It shows how many wards are down, since you can only have 3 wards on the map at any given time now, regardless of source. It provides a little bit of balance to junglers now that everyone gets free wards. A jungle can look at a lane and get an idea of if it would be a waste of time trying to gank(eg. Support has 3 wards down, ADC has 1, pretty useless since you can pretty much tell those would be dragon, tri, river entrance, and side brush)